This is a sidereal clock that is designed to work using the cheap clock movements that run for years on a single AA battery. It does this by gearing down the hour hand of the standard clock movement to sidereal time.

Print the bracket and outputgear with supports. The clock movement should come with all of the mounting hardware. Mount the movement to the bracket, then press the 61 tooth gear onto the hour shaft of the movement. Mount the compound gear with the small gear side down on the pin on the bracket. And the output gear onto the large bearing on the bracket, ensuring all gears mesh. [You can test the movement by using the wheel on the movement used to set the time]. Snap the movement on to the faceplate, and insert the hour hand so that it press fits into the output gear. Look up your sidereal time for your longitude, and set the time. The time can be set using the normal wheel on the back, or by simply forcing the hour hand to the correct time (the print layers should allow some movement while staying in place laterally).

The bracket also has eyelets to allow it to be screwed to pretty much anything if you want to provide your own faceplate. The provided faceplate is designed to be about 8" wide, so the faceplate can be printed on a standard printer.

Where the hour hand points is what will be culminating to the South at that time. E.g. at about 19h, Sagittarius will be as high as it gets in the South, everything along the hour hand will be reaching its highest point in the sky. The ecliptic circle shows where the Sun will be at the beginning of each month. You can easily get an idea of what you can't see that day, but also, when the hour hand points the opposite way, it shows what will be culminating in the South at sunset.

For the clock movement, I used the 7/8" shaft version here:
https://www.amazon.com/dp/B09JNKG6QP?ref=ppx_yo2ov_dt_b_product_details&th=1

It should work with any other's as long as the shaft is the same length. I highly recommend the "non-ticking" versions like the one above.